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Stephen Hawking's final multiverse theory, completed just 10 days before his death on March 14, 2018, was a groundbreaking attempt to explain how humanity might detect parallel universes. Co-authored with physicist Thomas Hertog, the paper, titled "A Smooth Exit from Eternal Inflation," was published posthumously in the Journal of High Energy Physics. It builds on the concept of eternal inflation, which suggests that after the Big Bang, the universe underwent rapid expansion, creating multiple "bubble" universes with potentially different physical laws and constants. Hawking and Hertog proposed a mathematical framework to simplify the multiverse concept, addressing the challenge of infinite universes with varying properties. Their theory predicts that our universe is part of a finite set of universes with similar physical characteristics, making the multiverse more testable. They suggested that evidence of parallel universes could be detected through cosmic microwave background (CMB) radiation, the "echo" of the Big Bang. Specific patterns or anomalies in the CMB could indicate interactions between our universe and neighboring ones, offering a potential signature of the multiverse. The theory also introduces a "holographic" approach, suggesting the universe's history is encoded on its boundary, akin to a hologram. This could allow scientists to probe the multiverse indirectly. While not yet experimentally verified, the work provides a pathway for future observations, possibly through advanced telescopes or space probes, to test for these cosmic signatures, bringing humanity closer to confirming the existence of parallel universes.